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Since the public release of its earliest version last year, Silverlight has been touted as Microsoft's Flash killer. This relatively new Web development platform aims to challenge Adobe's venerable Flash (and associated Flex development tools) in the online multimedia space.

Its first version was a little rough, experts say, but the beta of Silverlight 2 (released in March) shows that Microsoft could indeed have a shot at challenging Adobe Systems' hugely popular Web media platform. But adoption of Silverlight by developers or end users has yet to take off. Realistically, it's going to take more than Silverlight being able to overcome, or to simply match, the technology of Flash, according to many observers.

So I consulted industry analysts and a professional Web developer familiar with both platforms for their views on what elements are affecting Silverlight's odds in the rich Internet applications (RIA) development arena as it enters its second year.

1. Microsoft's technology on the Web

First and foremost, Silverlight was devised to bring the Windows Presentation Foundation (WPF) programming model to Web applications, and with that, the large .Net developer community. Between the Adobe Flash and Microsoft offerings, "it is not a feature war; each platform can tout some advantages. [Silverlight] is mostly about bringing Microsoft's developer ecosystem to the Web," says Al Hilwa, an analyst at market research firm IDC.

"It enables Microsoft's technology stack to have a rich media story for the Web. They didn't before; they do now," says Atlanta-based Jesse Warden, who has been developing professionally in Flash since 1998. "This means they can utilize and interface with a lot of their existing technology," says Warden, who has also started working in Silverlight.

Greg DeMichillie, an analyst at Directions on Microsoft, describes Silverlight 1.0 as "a placeholder narrowly focused on video, and not a full platform. The real action begins with the second version."

Currently in beta and set for release sometime later this year, Silverlight 2 is expected to tout more of the kind of "hard-core" graphical user interface programming that Adobe's Flex platform features. It will leverage Microsoft's strongest developer technologies: Visual Studio, C#, and the .Net Framework.

"Silverlight 2 feels like it's going to be a full-on contender with Flash and Flex in a short time. Then the battle will be over ubiquity, developer hearts and minds, and control of the Web," says Michael Cote, an analyst at RedMonk.

2. The enduring appeal of Flash development

Adobe is the clear leader today, but while Flash has improved technically over the years, it is still quirky from the perspective of hard-core development," says Hilwa.

But Flash continues to appeal to most Web designers and animators, despite improvements that are coming to the next version of Silverlight. "Version 1 of Silverlight was OK. Version 2 is definitely hot, especially when compared to where Flash Player 9 is at," says Warden. "Regardless, I'll currently stick to Flex and Flash. It's currently more fun, and there is more money in it."

3. Wider cross-platform support

"I'm always waiting for the .Net CLR [Common Language Runtime] to be a big deal. But without solid cross-platform support on runtime and tools, the CLR's benefits are limited to Windows developers," says Cote. "If there's a good cross-platform and even -- dare I say it? -- open-source [feature] when it comes to runtimes and tools, new developers will be interested as well."

In fact, Warden's advice for Adobe to continue to make its Flex system competitive with Silverlight coincides with Cote's view on what Microsoft should do for future iterations of Silverlight: "Keep the open-source mentality going strong, and keep up with the Linux support.

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